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hwmon: (ina3221) Add voltage conversion time settings

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The CONFIG register has two 3-bit fields for conversion time
settings of Bus-voltage and Shunt-voltage, respectively. The
conversion settings, along with averaging mode, allow users
to optimize available timing requirement.

This patch adds an 'update_interval' sysfs node through the
hwmon_chip_info of hwmon core. It reflects a total hardware
conversion time:
    samples * channels * (Bus + Shunt conversion times)

Though INA3221 supports different conversion time setups for
Bus and Shunt voltages, this patch only adds the support of
a unified setting for both conversion times, by dividing the
conversion time into two equal values.

Signed-off-by: Nicolin Chen <[email protected]>
[groeck: .rst related formatting changes in documentation]
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Nicolin Chen 2019-04-17 16:12:10 -07:00 • committed by Guenter Roeck
commit 023912dbb8
2 changed files with 63 additions and 8 deletions
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13
Documentation/hwmon/ina3221.rst
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@ -46,4 +46,17 @@ samples Number of samples using in the averaging mode.
Supports the list of number of samples:
1, 4, 16, 64, 128, 256, 512, 1024
update_interval Data conversion time in millisecond, following:
update_interval = C x S x (BC + SC)
* C: number of enabled channels
* S: number of samples
* BC: bus-voltage conversion time in millisecond
* SC: shunt-voltage conversion time in millisecond
Affects both Bus- and Shunt-voltage conversion time.
Note that setting update_interval to 0ms sets both BC
and SC to 140 us (minimum conversion time).
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